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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6aacf00e7c18d6b8393390762ee2fb34d7a53e38501fb91982d29cdd69cc30a' 
  AND token = 'ZL5xL0+hopjHXGeTFuiGmbfyCxMHX6PnF6Cd/UhF3H0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00142

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}